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annotate Simoleon/Helpers/Persistence.swift @ 156:84137052813d

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Refactor code
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 28 Aug 2021 11:15:25 +0100
parents Simoleon/Persistence.swift@ecc58b9cd89d
children 35628bac01f5
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1 //
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2 // Persistence.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 08/07/2021.
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6 //
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7
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8 import CoreData
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9
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10 struct PersistenceController {
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11 static let shared = PersistenceController()
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13 static var preview: PersistenceController = {
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14 let result = PersistenceController(inMemory: true)
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15 let viewContext = result.container.viewContext
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17 for _ in 0..<10 {
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18 let favorite = Favorite(context: viewContext)
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19 favorite.currencyPair = "GBP/USD"
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20 }
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21 do {
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22 try viewContext.save()
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23 } catch {
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24 /*
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25 Replace this implementation with code to handle the error appropriately.
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26 fatalError() causes the application to generate a crash log and terminate.
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27 You should not use this function in a shipping application, although it may be useful during development.
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28 */
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29 let nsError = error as NSError
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30 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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31 }
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32 return result
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33 }()
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34
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35 let container: NSPersistentCloudKitContainer
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37 init(inMemory: Bool = false) {
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38 container = NSPersistentCloudKitContainer(name: "Simoleon")
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39 container.viewContext.automaticallyMergesChangesFromParent = true
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40 container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
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41 if inMemory {
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42 container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
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43 }
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44 container.loadPersistentStores(completionHandler: { (storeDescription, error) in
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45 if let error = error as NSError? {
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46 /*
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47 Replace this implementation with code to handle the error appropriately.
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48 fatalError() causes the application to generate a crash log and terminate.
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49 You should not use this function in a shipping application, although it may be useful during development.
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50 */
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51
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52 /*
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53 Typical reasons for an error here include:
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54 * The parent directory does not exist, cannot be created, or disallows writing.
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55 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
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56 * The device is out of space.
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57 * The store could not be migrated to the current model version.
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58 Check the error message to determine what the actual problem was.
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59 */
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60 fatalError("Unresolved error \(error), \(error.userInfo)")
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61 }
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62 })
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63 }
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64 }